Blender Video Editor: Clip stays attached to cursor after releasing left click during drag
With the clip selected, you can hit 'g' to move (just like the 3D view, the Graph Editor, the Node editor, etc) and use your mouse to reposition the sequence. When you are finished, left-click to accept, or right-click to undo.

I think you will find that this is very easy to use, and, even better (because it is exactly like the rest of blender) it is also easy to remember.